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Abstract

This article describes a device, as shown in Figs. 1-3, which replaces the four conventional wrap plugs used on remote controllers. This device also supports a serial pulse counter and an LCD display used in controller testing.

Country

United States

Language

English (United States)

This text was extracted from an ASCII text file.

This is the abbreviated version, containing approximately
52% of the total text.

Switchable Communications Interface Wrap Plug

This article
describes a device, as shown in Figs. 1-3,
which replaces the four conventional wrap plugs used on remote
controllers. This device also supports a
serial pulse counter and an
LCD display used in controller testing.

The
controller supports three different communications
interfaces: EIA 232D (CCITT V.24/V.28),
CCITT V.35, and CCITT X.21.
The wrap plug is used to route transmitted signals back to the
receivers on the communications circuitry to aid in diagnosing
communications interfaces. A unique wrap
plug was required to
support each communication interface. In
addition, V.35 requires two
separate wrap plugs, each wrapping one half of the signals of the
differential lines, for a total of four required wrap plugs.

A single
25-pin DSUB connector is used for all electrical
interfaces in both the controller and in the switchable wrap plug. A
four- position rotary switch on the wrap plug energizes the
appropriate relays. The signals from the
25-pin connector connect
the proper signals required for each wrap connection.

The wrap plug
assumes that the cables connect only those
signals required by that interface so that extra signals on unused
pins do not interfere with the test. The
cables take the signals at
the assigned positions on the DTE side and route them to the correct
position on the DCE side, which has the correct connector defined for
the interface. Communications controller cables were used intact
which defined the wrap connections needed.

The
switchable wrap plug is superior to the four separate wrap
plugs because it allows the same plug to be used for any controller
model being tested. This simplifies
testing. In addition, because
one model of the controller supports both EIA 232D and CCITT V.35,
two interfaces can be tested on the same controller without
physically swapping wrap plugs, which would have required three
different wrap plugs before.